Laser rangefinders
In industrial applications, in addition to the laser sensor, there is also a sensor with similar functions, namely the ultrasonic displacement sensor. Although the ultrasonic displacement sensor is much cheaper due to the simple manufacturing process, it has a fatal disadvantage, namely; the ultrasonic beam is not point-shaped and The response time is longer.
Those who are familiar with ultrasonic sensors know that when the ultrasonic signal is announced in a scattered shape, the larger the range, the larger the area, and once a point is blocked, the signal will be transmitted back, so the application is very limited.
But the laser sensor is just a light spot, whether it is a small hole or a distant object, it can be used, and the response time of the laser is very fast, so it can be used for rapid measurement.
However, light sensors have a fatal disadvantage, that is, they are afraid of water and dust. Some laser sensors can achieve IP65, but if there is water or dust on the surface of the transmitter during use, the light will be emitted back, resulting in False signal, at this point, the performance of laser is obviously inferior to ultrasonic.
